Oscillator structure



April 27, 1948. E STQRCK 0S0 ILLATOR STRUCTURE Filed June- 16, 1945 M UEINVEN TOR. EDWARD A. STORCK flax/aw. E L-u.

ATTORNEY Patented Apr. 27, 1948 OSCILLATOR STRUCTURE Edward A. Storck,Manasquan, the United States of America the Secretary of War N. J.,assignor to as represented by Application June 16, 1945, Serial No.599,945

(Granted under the act of March 3, 1883, as amended April 30, 1928; 3700. G. 757) 6 Claims.

The invention described herein may be manufactured and used by or forthe Government for governmental purposes, without the payment to me ofany royalty thereon.

The present invention relates to unitary, radiofrequency oscillatorstructures and is more particularly directed to a compactultra-high-frequency oscillator assembly incorporating a miniature tube.

Numerous applications exist for portable, selfsufiicient oscillatorstructures of highly compact, sturdy and light weight design. Forexample, in orientation tests for radio-frequency direction findinapparatus it is necessary to dispose a small transmitter at a knownpoint in the field in order to calibrate the movement of the directionfinding loop in terms of azimuth. Likewise, for radio-sonde purposeswhere a transmitter is borne aloft by a balloon a small reliableoscillator structure is needed. It is also desirable that simple meanshe provided for the tuning of the transmitter.

With the above requirements in view it is the primary object of thisinvention to afford a unitary oscillator structure which is completelyencased within a plug-in type housing.

It is another object of this invention to provide in a plug-in housingan oscillator of high efficiency having simple and readily adjustabletuning means.

An additional object of this invention is to provide a plug-in housingfor an oscillator which is sturdy, weather proof and adapted toinexpensive manufacture.

For a complete understanding of the invention as well as other objectsand. further features thereof reference is had to the following detaileddescription to be read in connection with the accompanying drawingswherein like components are designated by like numerals. The scope ofthe invention will be pointed out in the annexed claims.

In the drawing:

Figure 1 is an elevational view of a preferred embodiment of anoscillator structure in accordance with the present invention.

Figure 2 is a side view thereof,

Figure 3 shows separately the casing and tuning means for saidstructure, and

Figure 4 is a schematic circuit diagram of the oscillator.

Referring now to the drawing and more particularly to Figures 1 and 2,the oscillator assembly comprises a plug-in support l composed of adielectric material such as Lucite, polystyrene,

or any suitable plastic, having a base portion II, in the form of acylindrical block, a disc-shaped head l2, and a rectangular mountingplate |3 connectingbase II with head l2.

Cut into base H is a semi-cylindrical recess defining perpendicularplane surfaces l4 and I5. Plate I3 is secured at its lower end tosurfaces I4 by means of screws I6 received in threaded bores in base H.The upper end of plate I3 is forced into a diametrical slot cut intohead l2. Enclosing plug-in support in is a cylindrical casing l1, shownseparately in Figure 3, of dielectric material, whose internal diameteris equal to the outside diameter of base l, A circular groove is formedin head I2 to snugly receive the upper end of easing IT, and the casingis attached to support I a by means of screws fitted into threaded boresI8 formed in base I Projecting from the under surface of base l arethree banana type prongs I9, 20 and 2| which are arranged so that theirterminals screws ex" tend through base above surface l5, soldering lugsbeing secured thereto.

The oscillator components are illustrated physsically in Figures 1, 2and 3 and are shown schematically in Figure 4. The oscillator is of aconventional parallel line type including a U- shaped resonant tubularline 22, and a miniature triode 23. The arms of tube 22 are insertedwithin parallel passages extending longitudinally through mounting plateIS with the yolk of line 22 extending from the lower edge of the plate.Triode 23 is of the acorn unbased type such as the 955 vacuum tube andis inserted in a central aperture in plate l3 so that its flange liesagainst the plate surface. Suitable terminal clips 24 are attached toplate I3 and are disposed about triode 23 so as to receive the electrodepins thereof. The plate of tricde 23 is connected through a couplingcapacitor 25 to a tap on one arm on line 22 While the grid is connectedto a correspondingly positioned tap on the other arm through a capacitor26 paralleled by a grid leak 21.

The plate of triode 23 is directly connected to prong l9 by a lead 28inclosed within line 22. The mid point of line 22 is wired to prong 20and is also connected through a suitable radio frequency choke 29 to oneside of the filament of tube 23. The cathode of tube 23 is connectedthrough a radio frequency choke 30 to the mid point of line 22. Theother side of the filament is connected through radio frequency ch'oke3| to prong 2| and connected between said prong and the mid point ofline 22 is a by pass condenser 32.

Capacitor 25 is contained within a recess formed in plate 13, adjacentto one arm of line 22. Similarly, capacitor 26 and grid leak 21 arecontained within a recess adjacent to the other arm of line 22. Theoscillator assembly operates in conjunction with a battery box indicatedby dashed line 33, the filament voltage being applied between prongs 2|and 20 and the plate voltage between prongs 20 and I9.

Slidably received over dielectric casing I1 is a metal collar 34,composed of copper or other suitable non-magnetic material. When thestructure is assembled, collar 34 functions as a variable capacitancebetween the parallel arms of line 22 and by adjusting the position ofthe collar along casing l'l the frequency of the oscillator is varied.

Because of the dielectric nature of the casing H the oscillator hasconsiderable direct radiation, hence in most applications an externalantenna and transmission feed thereto is not needed. However, ifdesired, a dipole (not shown) or other suitable radiator may be mounteddirectly above head l2 and coupled to line 22 by a small loop or othermeans permitting the detachment of said head without breakingconnections.

When completely assembled the oscillator com ponents are fully protectedand weather proofed. Thus there has been shown a simple, compact,self-contained oscillator structure which may be readily replaced in theevent of electrical or mechanical defect.

While there has been described what is at present considered a preferredembodiment of the invention it is apparent that many changes andmodifications may be made therein without departing from the spirit andscope of the invention as defined in the accompanying claims.

What is claimed is:

1. A unitary oscillator structure comprising a dielectric cylindricalbase, a head member in spaced coaxial relation with said base, adielectric mounting plate attaching said base to said head, aradio-frequency oscillator circuit arranged on said mounting plate, adielectric cylindrical casing enclosing said base and said mountingplate, and a metal collar slidably received about said casing, saidcollar being electrically coupled to said oscillator circuit whereby thelongitudinal position of said collar on said casing controls theoperating frequency of said oscillator circuit.

2. A unitary oscillator structure comprising a dielectric cylindricalbase, a head member in spaced coaxial relation with said base, adielectric mounting plate attaching said base to said head, aradio-frequency oscillator circuit, including resonant means, arrangedonsaid mounting plate, a dielectric cylindrical casing enclosing saidbase and said mounting plate,

and a metal collar slidably received about said casing electricallyrelated to said resonant means whereby the position of said collar onsaid casing controls the operating frequency of said oscillator.

3. A unitary oscillator structure comprising a dielectric cylindricalbase having a plurality of prongs extending longitudinally therefrom, ahead member in spaced coaxial relation with said base, a dielectricmounting plate attaching said base to said head, an oscillator circuit,including resonant means, arranged on said mounting plate and having itspower terminals connected to said prongs, a dielectric cylindricalcasing enclosing said base and said mounting plate, and a metal collarslidably received about said casing and electrically related to saidresonant means whereby the position of said collar controls theoperating frequency of said oscillator.

4. A unitary oscillator structure comprising a dielectric cylindricalbase having a plurality of prongs extending longitudinally therefrom, ahead member in spaced coaxial relation with said base, a dielectricmounting plate attaching said base to said head, an oscillator circuitstructure arranged on said mounting plate including a U-shaped resonantline longitudinally disposed within said plate, said oscillator havingits power terminals connected to said prongs, a dielectric casingenclosing said base and said mounting plate, and a metal collar slidablyreceived over said casing and electrically related to said resonant linewhereby the position of said collar on said casing controls theoperating frequency of said oscillator.

5. A unitary oscillator structure comprising a dielectric cylindricalbase having a plurality of prongs extending longitudinally therefrom, ahead member in spaced coaxial relation with said base, a dielectricmounting plate attaching said base to said head, an oscillator circuitarranged on said mounting plate including a U- shaped resonant linelongitudinally disposed within said mounting plate and a miniaturevacuum tube inserted in an aperture centrally disposed between the armsof said resonant line, said oscillator having its power terminalsconnected to said prongs, a dielectric cylindrical casing enclosing saidbase and said mounting plate, and a metal collar slidably received aboutsaid casing and electrically related to said resonant line whereby theposition of said collar on said casing controls the operating frequencyof said oscillator.

6. A unitary oscillator structure comprising a dielectric cylindricalcasing, a radio frequency oscillator circuit mounted within said casing,and a metal collar slidably received about said casing, said collarbeing electrically coupled to said oscillator circuit whereby thelongitudinal position of said collar on said casing controls theoperating frequency of said oscillator.

EDWARD A. STORCK.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Hammond Apr.- 28, 1942

